64464644 has 24 divisors (see below), whose sum is σ = 119461440. Its totient is φ = 30353184.

The previous prime is 64464643. The next prime is 64464649. The reversal of 64464644 is 44646446.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 64464598 and 64464607.

It is not an unprimeable number, because it can be changed into a prime (64464641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10697 + ... + 15599.

It is an arithmetic number, because the mean of its divisors is an integer number (4977560).

Almost surely, 2^64464644 is an apocalyptic number.

It is an amenable number.

64464644 is a deficient number, since it is larger than the sum of its proper divisors (54996796).

64464644 is a wasteful number, since it uses less digits than its factorization.

64464644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5099 (or 5097 counting only the distinct ones).

The product of its digits is 221184, while the sum is 38.

The square root of 64464644 is about 8028.9877319622. The cubic root of 64464644 is about 400.9656751361.

The spelling of 64464644 in words is "sixty-four million, four hundred sixty-four thousand, six hundred forty-four".